With all due respect to the OP, I just don't get the poll. By that, I mean that both are clearly very popular in all areas, fantasy being generally more popular, I believe (perhaps due to familiarity with base concepts), but I love them both. I think most people tend to find science fiction a bit more difficult to identify with, simply because there's far more fantasy stories out there and they've been around for so long. But that doesn't make fantasy better.
I could never choose one over the other, and my preference by a very large margin (as my Avatar tag shows) is a blend of both. Also, the genres listed are very broad, and people get confused on what belongs to what genre (for example: Some would say Star Wars is science fiction, others, fantasy, and still others would adopt other various classifications for it). Me, I prefer the term "blended-genre" and find some distinctions between it and multi-genre, but I have my reasons, and the waters are all pretty muddy.
Even authors don't always agree on the classifications of their own works. Their readers have one opinion and they have another, and sometimes the bookstores have yet another.
No matter how much I love pure fantasy and love pure science fiction, I've always far more enjoyed when there's at least some overlap! Just my two cents. I have nothing against people that love their genres pure, like I said.